 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.core;

 import org.eclipse.core.runtime.*;

 /**
  * Verifier. This interface abstracts the archive verification step
  * performed by specific feature implementations. The actual details
  * of the verification are the responsibility of the concrete implementation.
  * <p>
  * Clients may implement this interface.
  * </p>
  * <p>
  * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  * </p>
  * @see org.eclipse.update.core.IVerificationResult
  * @see org.eclipse.update.core.IFeatureContentProvider#getVerifier()
  * @since 2.0
  */
 public interface IVerifier {

     /**
      * Perform verification of the specified archive.
      *
      * @param feature feature containing this archive
      * @param reference actual archive reference
      * @param isFeatureVerification <code>true</code> indicates the specified
      * reference should be considered as part of the feature description
      * information (ie. verifying the overall feature),
      * <code>false</code> indicates the specified reference is a plug-in
      * or a non-plug-in archive file (ie. verifying a component of the
      * feature)
      * @param monitor progress monitor, can be <code>null</code>
      * @return verification result
      * @exception CoreException
      * @since 2.0
      */
     public IVerificationResult verify(
         IFeature feature,
         ContentReference reference,
         boolean isFeatureVerification,
         InstallMonitor monitor)
         throws CoreException;
         
     /**
      * Sets the parent verifier.
      *
      * The parent verifier can only be set once by the parent feature.
      * It may used for different verification strategies.
      * (for instance, you may decide that both the parent and current verifier
      * must sucessfully verify the content reference, or that only one of them must verify)
      * @param parentVerifier the parent verifier.
      */
     public void setParent(IVerifier parentVerifier);
     
     /**
      * Returns the parent verifier
      *
      * @return the parent verifier
      * @since 2.0
      */
     public IVerifier getParent();
 }

